Test PHP 7.3 and 7.4 (#205)
Test PHP 7.3 and 7.4 (#205)

* Test PHP 7.3 and 7.4

* Update .travis.yml

* Update .travis.yml

eileenmcnaughton/common,xola/omnipay-common,eileenmcnaughton/common,thephpleague/omnipay-common